The open source OpenXR runtime
os/time: Add windows impl of os_realtime_get_ns
authored by
Christoph Haag
and committed by
Jakob Bornecrantz
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src/xrt/auxiliary/os/CMakeLists.txt
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src/xrt/auxiliary/os/CMakeLists.txt
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# by applications like the OpenXR runtime library.
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#
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add_library(aux_os STATIC os_documentation.h os_hid.h os_hid_hidraw.c os_threading.h)
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add_library(
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aux_os STATIC
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os_documentation.h
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os_hid.h
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os_hid_hidraw.c
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os_threading.h
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os_time.cpp
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)
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target_link_libraries(aux_os PUBLIC aux-includes xrt-pthreads)
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# Only uses normal Windows libraries, doesn't add anything extra.
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src/xrt/auxiliary/os/os_time.cpp
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src/xrt/auxiliary/os/os_time.cpp
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// Copyright 2023, Collabora, Ltd.
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// SPDX-License-Identifier: BSL-1.0
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/*!
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* @file
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* @brief Wrapper around OS native time functions.
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*
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* These should be preferred over directly using native OS time functions in
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* potentially-portable code. Additionally, in most cases these are preferred
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* over timepoints from @ref time_state for general usage in drivers, etc.
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*
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* @author Christoph Haag <christoph.haag@collabora.com>
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*
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* @ingroup aux_os
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*/
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#include "xrt/xrt_config_os.h"
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#ifdef XRT_OS_WINDOWS
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#include <inttypes.h>
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#include <chrono>
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extern "C" uint64_t
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os_realtime_get_ns(void)
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{
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auto now = std::chrono::system_clock::now();
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auto nsecs = std::chrono::time_point_cast<std::chrono::nanoseconds>(now);
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auto ret = nsecs.time_since_epoch().count();
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return ret;
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}
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#endif
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src/xrt/auxiliary/os/os_time.h
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src/xrt/auxiliary/os/os_time.h
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os_realtime_get_ns(void);
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#endif
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#if defined(XRT_OS_WINDOWS)
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/*!
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* Return a realtime clock in nanoseconds
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*
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* @ingroup aux_os_time_extra
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*/
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uint64_t
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os_realtime_get_ns(void);
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#endif
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#if defined(XRT_OS_WINDOWS) || defined(XRT_DOXYGEN)
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/*!
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* @brief Return a qpc freq in nanoseconds.